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2.铝及铝合金(1)纯铝纯铝是一种银白色金属,是从铝土矿中提取、冶炼而得,曾叫做“泥土里的银子”,今天则是重要的日用金属,是地球上分布最广的金属。纯铝的比重为2.7,熔点为660℃。铝具有良好的导电性,仅次于银和铜,铝广泛用来制造电线,电缆。铝的导热性也很好,在工业上用来制造热交换器、散热器、传热器材等。铝还有良好的耐蚀能力,在空气中能与氧结合,形成一层致密的氧化铝薄膜,保护铝不再继续氧化。铝还耐浓硝酸和醋酸的腐蚀,工业上常用铝罐贮放浓硝酸和醋酸或做接触二酸的管道。
2. Aluminum and Aluminum Alloy (1) Pure Aluminum Pure aluminum is a silvery white metal which is extracted from bauxite and smelted. It was once called “silver in the soil”, and today it is an important daily-use metal. Is the most widely distributed metal on Earth. Pure aluminum has a specific gravity of 2.7 and a melting point of 660 ° C. Aluminum has good electrical conductivity, second only to silver and copper, aluminum is widely used to manufacture wires and cables. Aluminum thermal conductivity is also very good, used in the industry to create heat exchangers, radiators, heat transfer equipment. Aluminum also has good corrosion resistance, in the air can combine with oxygen to form a dense layer of aluminum oxide film, aluminum is no longer continue to protect the oxidation. Aluminum is also resistant to corrosion of concentrated nitric acid and acetic acid, aluminum cans commonly used in industrial storage of concentrated nitric acid and acetic acid or do contact with the diacid pipeline.